Initialize MergingDrawBatch clip with viewport bounds

This allows merged, clipped operations to behave correctly within a
savelayer, even if the base viewport has a large offset.

Additionally, disregard opaqueness when within a
complexclip/savelayer, as the coverage can't be trusted.

Change-Id: Ic908b82a4bb410bc7fac1b4295f4874ed166efc5

1 files changed, 1 insertions, 0 deletions

diff --git a/libs/hwui/OpenGLRenderer.cpp b/libs/hwui/OpenGLRenderer.cpp
index d6d7b7fb24bd..6f1dc6f3e71f 100644
--- a/libs/hwui/OpenGLRenderer.cpp
+++ b/libs/hwui/OpenGLRenderer.cpp
@@ -827,6 +827,7 @@ int OpenGLRenderer::saveLayerDeferred(float left, float top, float right, float
         if (!mSnapshot->isIgnored()) {
             mSnapshot->resetTransform(-bounds.left, -bounds.top, 0.0f);
             mSnapshot->resetClip(clip.left, clip.top, clip.right, clip.bottom);
+            mSnapshot->viewport.set(0.0f, 0.0f, bounds.getWidth(), bounds.getHeight());
         }
     }